wu-sheng commented on a change in pull request #4514: Add selector property in 
application.yml
URL: https://github.com/apache/skywalking/pull/4514#discussion_r392670096
 
 

 ##########
 File path: 
oap-server/server-bootstrap/src/main/java/org/apache/skywalking/oap/server/starter/config/ApplicationConfigLoader.java
 ##########
 @@ -105,6 +112,48 @@ private void 
overrideConfigBySystemEnv(ApplicationConfiguration configuration) {
         }
     }
 
+    private void selectConfig(final Map<String, Map<String, Object>> 
moduleConfiguration) {
+        final Set<String> modulesWithoutProvider = new HashSet<>();
+        for (final Map.Entry<String, Map<String, Object>> entry : 
moduleConfiguration.entrySet()) {
+            final String moduleName = entry.getKey();
+            final Map<String, Object> providerConfig = entry.getValue();
+            if (!providerConfig.containsKey(SELECTOR)) {
+                continue;
+            }
+            final String selector = (String) providerConfig.get(SELECTOR);
+            final String resolvedSelector = 
PropertyPlaceholderHelper.INSTANCE.replacePlaceholders(
+                selector, System.getProperties()
+            );
+            providerConfig.entrySet().removeIf(e -> 
!resolvedSelector.equals(e.getKey()));
+
+            if (!providerConfig.isEmpty()) {
+                continue;
+            }
+
+            if (!DISABLE_SELECTOR.equals(resolvedSelector)) {
+                throw new RuntimeException(
 
 Review comment:
   This should be `ProviderNotFoundException`

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